%% Image selected per Image Pickin' thread: http://tvtropes.org/pmwiki/posts.php?discussion=bnu9358yp3rj4x3erizw21ha%% Please do not change or remove without starting a new thread.%%[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/killer_robot_4683.jpg]][[caption-width-right:350:[[foldercontrol]]

A {{robot}} or other physically autonomous machine guided by a [[AIIsACrapshoot level of intelligence]] and a homicidal urge to KillAllHumans. Prone to ending sentences with exclamation points as well as SpockSpeak. Killer Robots are so common because AIIsACrapshoot.

Humanoid killer robots abound, such as the [[TropeNamer original]] ''Theatre/{{RUR}}'', or those in ''Series/DoctorWho'''s subtly named serial ''[[Recap/DoctorWhoS14E5TheRobotsOfDeath The Robots of Death]]''. However, killing machines come in all shapes and sizes; from robotic dreadnoughts in space to airborne robo-fighters, through small drones and down to microscopic or even {{nano|machines}}scopic [[GrayGoo killers]].

Although the traditional versions of this trope were robots built in a MadScientistLaboratory who TurnedAgainstTheirMasters, today a more common plot involves the villain finding and [[MoralityDial turning the switch]] on a kid's RobotBuddy from "good" to "evil", forcing the cast to destroy them. Especially [[NightmareFuel scary]] because this was a good friend who has become completely heartless and bent on death.

MechanicalLifeforms are capable of veering into this, but generally tend to skimp on the SpockSpeak in favor of something a bit more colorful.